Ruby Rails 3.2 Locale with folder_name path in URL - ruby

Question

I have a trio of Ruby/Rails applets running under the following setup:
services.mydomain.com/applet1
services.mydomain.com/applet2
services.mydomain.com/applet3
These are served via Phusion Passenger, and App1 and App2 work exactly as expected.
The problem is with App3 which uses I18n Locales embedded in the URL:
services.mydomain.com/applet3/en/
services.mydomain.com/applet3/fr/
services.mydomain.com/applet3/es/
The problem seems to be that the link_to URLs don't seem to include the "applet3". So instead of:
services.mydomain.com/applet3/en/signin
I get:
services.mydomain.com/en/signin
... which is unrouteable.
My routes.rb looks like:
Rails.application.routes.draw do
scope "(:locale)", locale: /#{I18n.available_locales.join("|")}/ do
resources :users
resources :sessions, only: [:new, :create, :destroy]
match '/signup', to: 'users#new'
match '/signin', to: 'sessions#new'
match '/signout', to: 'sessions#destroy', via: :delete
match '/help', to: 'static_pages#help'
match '/about', to: 'static_pages#about'
root to: "static_pages#home"
end # scope locale
end # Rails.application.routes.draw do
... and in app/controllers/application_controller.rb I have:
before_filter :set_locale_from_params
def url_options
{ only_path: true, locale: I18n.locale }
end
protected
def set_locale_from_params
if params[:locale]
if I18n.available_locales.include?(params[:locale].to_sym)
I18n.locale = params[:locale]
else
flash.now[:notice] = 'Translation not available'
logger.error flash.now[:notice]
end
end
end
... and in config/environments/production.rb I have:
Rails.application.routes.default_url_options[:host] = 'http://services.mydomain.com/applet3/'
EDIT1: add example link_to statement
<%= link_to(t(".#{language}"), root_path(locale: language)) %>
/EDIT1
If I move App3 to a more "normal" arrangement where there is no "folder_name" in the URL path, everything works fine. So it's something simple I'm missing with how to set up the scope or the URL Options.
Thanks in advance for any help & suggestions!

Answer 1

what about use constraints into your route to define your sub module route ?
Rails.application.routes.draw do
constraints(:host) do
scope :path => ":locale" , locale: /#{I18n.available_locales.join("|")}/ do
resources :users
resources :sessions, only: [:new, :create, :destroy]
match '/signup', to: 'users#new'
match '/signin', to: 'sessions#new'
match '/signout', to: 'sessions#destroy', via: :delete
match '/help', to: 'static_pages#help'
match '/about', to: 'static_pages#about'
root to: "static_pages#home"
end # scope locale
end # constraints
end # Rails.application.routes.draw do

Answer 2

You are using root_path and expecting applet3 to be added, on doing rake routes did you check what was the path for root ?
You might have to explicitly set the root path in your routes file to enable routes_path work properly.